when the number of protons and electrons are equal

Answer:

8

Explanation:

Answer:

the answer is 8 :D

Explanation:

2x4 also known as 2+2+2+2 is equal to 8

Ao H+HH OH

santa said he will eat shower curtian at 2 am

Answer:

200 kg

Explanation:

the 200 kg person is heavier due to gravity's force the 100 kg person has less force than the other person

Answer:

massive one that is 200kg

Explanation:

Since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. So as the mass of either object increases, the force of gravitational attraction between them also increases.

Answer:

V₂ = 530.5 mL

Explanation:

Given data:

Initial temperature = 20.0°C

Final temperature = 40.0 °C

Final volume = 585 mL

Initial volume = ?

Solution:

Initial temperature = 20.0°C (20+273 = 293 K)

Final temperature = 40.0 °C (40+273 = 323 K)

Solution:

The given problem will be solve through the Charles Law.

According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.

Mathematical expression:

V₁/T₁ = V₂/T₂

V₁ = Initial volume

T₁ = Initial temperature

V₂ = Final volume  

T₂ = Final temperature

Now we will put the values in formula.

V₁/T₁ = V₂/T₂

V₁ = V₂T₁ /T₂  

V₂ = 585 mL × 293 K / 323 K

V₂ = 171405 mL.K / 323 K

V₂ = 530.5 mL

Answer:

0.18× 10²³ molecules

Explanation:

Given data:

Mass of copper hydroxide = 3.30 g

Number of molecules = ?

Solution:

Number of moles = mass/molar mass

Number of moles = 3.30 g/97.56 g/mol

Number of moles = 0.03 mol

Avogadro number:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ molecules

0.03 mol × 6.022 × 10²³ molecules / 1mol

0.18× 10²³ molecules

Al is the limiting reactant and would run out quickly  and 357 g of aluminum oxide is produced.

The  limiting reactant is the reactant is the reactant that is present in the least amount in the system. This is the reactant that is going to run out most quickly. The limiting reactant would be the one that would determine the amount of product that is formed.

Now the reaction equation is shown in the image attached to the question above.

Number of moles of  Fe2O3 =  1.873 × 10^2 g /160 g/mol = 1.17 moles

Number of Al = 94.51 g Al/27 g/mol = 3.5 moles

If 1 mole of Fe2O3 reacts with 2 moles of Al

1.17 moles of Fe2O3 reacts with 1.17 moles  *  2 moles/ 1 mole

= 2.34 moles

Hence Al is the limiting reactant and would run out quickly.

Mass of aluminum oxide produced = 3.5 moles * 102 g/mol = 357 g

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Answer:

207g

Explanation:

Given compound:

            Ca(ClO₃)₂

The equivalent mass can be derived by summing the molar masses of each atom

  Molar mass of Ca = 40

                            Cl  = 35.5

                            O  = 16

Now solve;

 Molar mass  = 40 + 2(35.5 + 3(16)) = 207g

Answer:

B.sugar solution

Explanation:

A sugar solution is not a compound.

Rather, the solution is a mixture and an impure substance.

Answer:

competition

Explanation:

it would cause competition. both would fight for water and other stuff to grow and live

The graph (A) best represents the relationship between the volume and the pressure of a gas.

The force was applied perpendicular to an object's surface per unit area across which that force is spread is known as pressure. The relationship between pressure and volume can be understand with the aid of ideal gas law.

PV=nRT.

where, P is pressure, V is volume.

It can be seen that when temperature will kept constant then pressure will be inversely proportional to the volume. It can be shown as:

P ∝ 1/V.

Therefore, graph A represent relationship between pressure (P) and volume (V).

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Explanation:

Chemical energy is energy stored in the bonds of chemical compounds, like atoms and molecules. This energy is released when a chemical reaction takes place. Usually, once chemical energy has been released from a substance, that substance is transformed into a completely new substance.

Answer:

Breaking or making of chemical bonds involves energy, which may be either absorbed or evolved from a chemical system. Energy that can be released or absorbed because of a reaction between a set of chemical substances is equal to the difference between the energy content of the products and the reactants, if the initial and final temperatures are the same.

Explanation:

Statements 6,9,13,14 are hypertonic, 8,10,12 hypotonic, and 7,11,15 are isotonic solutions.

6. Hypertonic

7. Isotonic

8. Hypotonic

9. Hypertonic

10. Hypotonic

11. Isotonic

12. Hypotonic

13. Hypertonic

14. Hypertonic

15. Isotonic

A hypertonic answer is any external solution that has excessive solute awareness and coffee water concentration as compared to frame fluids. In a hypertonic answer, the internet movement of water will be out of the frame and into the solution.

A hypotonic answer has a decreased awareness of solutes than some other answer. In biology, a solution outdoor of a cell is referred to as hypotonic if it has a decreased attention of solutes relative to the cytosol. because of osmotic stress, water diffuses into the cell, and the cell often appears turgid, or bloated.

A solution that has the same salt concentration as cells and blood. Isotonic answers are typically used as intravenously infused fluids in hospitalized sufferers. Isotonic solutions include electrolyte stability just like plasma in the bloodstream. whilst an isotonic solution is administered, the fluid extent of the affected person is elevated without a fluid shift. not unusual examples of isotonic solutions are zero.nine% ordinary saline and lactated ringers.

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Explanation:

it's because when CO₂ reacts with H₂O then it forms H₂CO₃ (carbonic acid), which is a acid that's why a compound formed by CO₂ and H₂O is sour.

Reaction:

CO₂ + H₂O → H₂CO₃

Answer:

1+

Explanation:

the number of protons tells you which element it is in the periodic table, you can notice that there is 1 less electron that then there is protons which means that the element had to give 1 electron away. When you get rid of 1 e- you have 1 proton more that electrons so that's why it's 1+

also the element is Cr

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{3.18 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 5.282392...[/tex]

We have the final answer as

Hope this helps you

Answer:

2Na + 2H2O ----> 2NaOH + H2

Explanation:

Answer:

Explanation:

The momentum of an object can be found by using the formula

momentum = mass × velocity

From the question we have

momentum = 45 × 1544

We have the final answer as

Hope this helps you

Answer:

69,480 kg. m/s

have a nice day!

Answer:

The Plasma Membrane.

Explanation:

The eukoryotic cell is enclosed in a limiting membrane called the Plasma Membrane or Plasmalemma. ❤️

Answer: same valence shell configuration and properties

Explanation:

Answer:

D. all of the above

Explanation:

edg 2021

A way that human modification of limiting factors causes unbalances in ecosystems. are habitat loss, pollution, and climate change. Option D. This is further explained below.

Generally, An ecosystem is a geographical region in which plants, animals, and other species, as well as weather and topography, coexist to produce a circle.

In conclusion, habitat loss, pollution, and climate change are all human modification of limiting factors causes unbalance in ecosystems.​

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CQ

which of the following is a way that human modification of limiting factors causes unbalance in ecosystems? a. habitat loss b. pollution c. climate changes d. all of the above

Answer:

b dissociate

Explanation:

Answer:

the anserw is 2

Explanation:

Answer:

Law of multiple proportions

Explanation:

A 36.0 g sample of metal was heated from 0°C to 55.0°C. It absorbed 150 J of energy as heat then the specific heat of this piece of metal is 0.0758 J/g.°C  .

The term "specific heat" refers to the amount of energy needed to raise a substance's unit mass by one degree Celsius. This can be mathematically stated as:

q = m×c×ΔT,

where ,

q = the amount of heat

m = the mass of the substance

c = the respective substance's specific heat;

ΔT = the change in temperature.

So, if we want to determine the units for specific heat, we'll just isolate the term in the above formula to get

c = q / m × ΔT                    ( i )

Since heat is measured in Joules ( J ) , mass in grams ( g ) , and temperature in degree Celsius , we can determine that specific heat capacity from equation ( i )  by putting all the given data in this equation ,

c =  150 J / 36.0 g × 55.0 °C = 150 J / 1980 g.°C = 0.0758 J/g.°C

Therefore, specific heat is measured in Joules per g times degree Celsius.

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Answer:

the answer is 40% but, correct me if I'm wrong

Explanation:

Answer:

40%

Explanation:

Mass of carbon / total mass × 100

72/180× 100 = 40%

The process of photosynthesis converts light energy into stored chemical energy by converting carbon dioxide plus water into sugars plus released oxygen.

Utilizing a process called photosynthesis, plants and other living things may transform light energy into chemical energy that can then be released through cellular respiration to power their activities. Photosynthesis, from the Greek phs (light) and synthesis (putting together), derives from the fact that some of this chemical energy is stored in carbohydrate molecules, such as sugars and starches, which are created from carbon dioxide and water.

Photoautotrophic organisms, such as the majority of plants, algae, and cyanobacteria, carry out photosynthesis. The majority of the energy required for life on Earth is produced and maintained through photosynthesis, which is also primarily responsible for producing and maintaining the oxygen concentration of the Earth's atmosphere.

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Answer:

The main products are ATP, carbon dioxide, and water.

The monoatomic gas : He

In general, the gas equation can be written  

[tex]\large {\boxed {\bold {PV = nRT}}}[/tex]

where  

P = pressure, atm  

V = volume, liter  

n = number of moles  

R = gas constant = 0.08206 L.atm / mol K  

T = temperature, Kelvin  

P 380.9 mmHg = 0.5 atm

T 20 C+273 = 293 K

We can find molar mass of gas :

[tex]\tt M(molar~mass(M)=\dfrac{mRT}{PV}\\\\M=\dfrac{8~g\times 0.082\times 293~K}{0.5~atm\times 96~L}\\\\M=4~g/mol[/tex]

monatomic gas means a single element, usually a noble gas. The noble gas element with mass 4 is He